Scene lit by both direct and indirect light, notice
the shadowed floor reflect the red and blue curtain

The back of the knight is illuminated by
indirect lighting only

Another camera angle

Light buffer showing only indirect lighting

Light buffer with both direct and indirect lighting

The above screen shots are captured with 512x512x512 voxel resolution, illuminated by one directional light. The indirect illumination show some flicking when the camera move if the shadowing map resolution is not high. Also the performance is not good on my GTX460, performing anisotropic mip-mapping takes up most of the time... I will write more posts on it after tidying up all the stuffs, hope everything can be finished by the end of this year...